Browse > Article
http://dx.doi.org/10.3795/KSME-A.2007.31.6.718

Analysis of Damage Trend for Gas Turbine 1st Bucket Related to the Change of Models  

Kim, Moon-Young (한전KPS㈜ GT정비기술센터)
Park, Sang-Yeol (한전KPS㈜ GT정비기술센터)
Yang, Sung-Ho (한전KPS㈜ GT정비기술센터)
Choi, Hee-Sook (한전KPS㈜ GT정비기술센터)
Ko, Won (한전KPS㈜ GT정비기술센터)
Song, Kuk-Hyun (한전KPS㈜ GT정비기술센터)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.6, 2007 , pp. 718-724 More about this Journal
Abstract
Some of gas turbine model of 7F-Class has constructed and is operating with units domestically. Non-destructive testing (NDT) is one of the methods being used to inspect damage $1^{st}$ stage bucket and review damage trends. We also analyze damage configuration and microstructure according to material and compare with pape of electric power research institute (EPRI). The damaged mode could be determined by leveraging failure analysis. Especially, configuration uprate of bucket is not only to prevent damage during operation but also avoid domestic manufacturing by the competitors. Modifications were mainly concentrated on surfaces such as cooling hole and bucket tips. Analyzing of bucket damage, the earlier model of 7F-Class used with one cycle with equivalent operation hour (EOH), has various cracking of the bucket surface. Bucket damage of new model is centered on tip area (54%) as analyzed by EPRI research. We conclude that improving bucket configuration would increase repair rate on the bucket tip.
Keywords
DS(Directional Solidification); EA(Equiaxed); FOD(Foreign Object Damage); EOH(Equivalent Operation Hour); TMF(Thermo-Mechanical Fatigue);
Citations & Related Records
연도 인용수 순위
  • Reference
1 Meherwan P. Boyce, 'Gas Turbine Engineering Handbook,' Gulf Professional Oublishing, Second Edition, pp. 431~432
2 Viswanatan, R., 'Damage Mechanisms and Life Assessment of High-Temperature Components,' ASM International, pp. 422-448
3 David Balevic, Robert Burger and David Forry, 'Heavy-Duty Gas Turbine Operating and Maintenance Considerations,' GER 3620K, GE Power, pp. 32-33
4 Frederick, G., 2003, 'Laser Welding Repair of Service Exposed IN 738 and GTD 111 Buckets' EPRI TR-1004345, pp. 1-5-1-8
5 Viswanatan, R., 1999, 'Assessment of the Laser Welding Process for Superalloy Gas Turbine Blade Welding,' EPRI TR-113748, pp. 2-8-2-10